Application of Linear Frequency Modulation Pulse Compression in Air-coupled Ultrasonic Testing

摘要：

Effective signal processing technology should be used to improve signal-to-noise ratio in air-coupled ultrasonic testing, because of there is feeble signal and low signal-to-noise ratio. Pulse compression of linear frequency modulation could enhance systems signal to noise ratio and distance resolution effectively. Principle of linear frequency modulation pulse compression is introduced, including of designing and accomplishing of matching filter. The relationship between pulse compression parameters and testing result is analyzed. The affect of exciting mode to ultrasonic signal and pulse compression to signal-to-noise ratio are researched by comparing experiment results. Air-coupled ultrasonic C-scan testing system based on pulse compression is accomplished, and the effectiveness of pulse compression method is testified by ultrasonic imaging results.

关键词： air-coupled ultrasonic linear frequency modulation pulse compression C-scan imaging

作者: WEI Dong ZHOU Zhenggan NI Xiansheng

作者单位: Institute for Nondestructive Testing and Mechatronics Engineering Beihang University Beijing, 100191, CHINA

会议类型: 国际会议

会议名称: The 2nd IEEE International Conference on Advanced Computer Control(第二届先进计算机控制国际会议 ICACC 2010)

会议地点: 沈阳

会议语种:英文

页码: 53-57

在线出版日期: 2010-03-27（万方平台首次上网日期，不代表论文的发表时间）